Sudden Hearing Loss and HBOT: What the Studies Show

Sudden Sensorineural Hearing Loss (SSNHL) is characterized by an abrupt onset of hearing impairment, often developing over a few hours or days, and typically affecting a single ear. This rapid change in auditory perception can be a significant source of concern and can sometimes be accompanied by other symptoms like tinnitus (ringing in the ears) or dizziness. Sudden hearing changes warrant prompt medical attention, and Hyperbaric Oxygen Therapy (HBOT) has been studied extensively in this context. Knowing what that work has found helps you have an informed conversation with your physician.

Idiopathic SSNHL, sudden hearing loss with no identified cause, is among the conditions for which the FDA has cleared hyperbaric chambers. The Undersea and Hyperbaric Medical Society recognizes HBOT as an adjunct to standard medical therapy for this condition, delivered under physician direction. OxyRenew provides wellness sessions, not medical treatment, and this article reports findings from published studies.

Understanding Sudden Sensorineural Hearing Loss (SSNHL)

The precise cause of SSNHL is not always identifiable, but it is often linked to factors such as compromised blood flow to the cochlea (the inner ear's hearing organ), viral infections, inflammatory responses, or autoimmune conditions. The hair cells within the cochlea, which are vital for hearing, are highly metabolically active and extremely sensitive to reductions in oxygen supply (hypoxia) and inflammation. When these cells are stressed or damaged, hearing can be significantly impacted.

It’s important to recognize that sudden changes in hearing warrant prompt medical attention. OxyRenew welcomes individuals to learn about HBOT, and we encourage an initial consultation with a physician or audiologist. That consultation provides a diagnosis and rules out other conditions that may need specific treatment. Any role for HBOT in your care is your physician's decision.

HBOT and the Inner Ear

Hyperbaric Oxygen Therapy involves breathing oxygen within a pressurized environment. At OxyRenew, our hard-shell chamber maintains a pressure of up to 2.0 ATA (atmospheres absolute). This significantly increases the concentration of oxygen dissolved in the blood plasma, enabling a greater supply of oxygen to reach tissues throughout the body, including those of the inner ear that may have restricted blood flow. Here is why oxygen delivery receives so much attention in studies of SSNHL:

• Enhanced Oxygen Delivery to Inner Ear Tissues: The inner ear's high metabolic rate and unique blood supply make it vulnerable to hypoxia. At pressure, oxygen dissolves directly into the plasma in addition to what hemoglobin carries, which may deliver additional dissolved oxygen to cochlear tissues with reduced blood flow.

• Inflammation and Swelling: HBOT has demonstrated anti-inflammatory effects in studies. Inflammation and edema within the confined space of the cochlea are among the processes thought to contribute to SSNHL, which is why this property draws attention in the literature.

• Hair Cell Metabolism: The hair cells of the cochlea are highly metabolically active and sensitive to oxygen supply. One hypothesis is that an oxygen-rich environment may support the metabolic function of stressed hair cells, an idea still being tested.

• Synergistic Effects with Corticosteroids: Corticosteroids are a cornerstone of conventional SSNHL treatment, primarily for their anti-inflammatory action. Research suggests a synergistic relationship between HBOT and steroid therapy. A comprehensive meta-analysis  published in JAMA Otolaryngology-Head & Neck Surgery involving over 2,400 patients found that adding HBOT to standard medical therapy (which includes corticosteroids) significantly improved both complete and any hearing recovery rates compared to medical therapy alone. The authors suggest the increased oxygen may improve steroid penetration into inner ear tissues. Whether and how this applies to an individual case is a conversation for your treating physician.

The Role of Timeliness in SSNHL and HBOT

In the context of SSNHL, prompt medical evaluation is generally associated with better prognoses. How the timing of any intervention applies to an individual case is a question for the treating physician.

While early intervention is encouraged, individuals at various stages of their hearing loss journey have explored HBOT. If you have been experiencing symptoms for some time, speak with your hearing healthcare provider about whether HBOT makes sense for you. Our technicians are happy to explain how our sessions work so you and your provider can decide together. Our aim is to provide clear information and support your informed choices.

About sessions at OxyRenew

OxyRenew operates one hard-shell chamber at 2.0 ATA, a pressure commonly used in published HBOT trials. Oxygen is delivered by mask or cannula, and a Certified Hyperbaric Technician stays with you for the entire session. Every session follows the same standard structure.

Talking with your physician about HBOT

If you are navigating the challenges of sudden hearing loss, a thorough medical evaluation is the critical first step for diagnosis and a primary treatment plan. From there, learning how HBOT has been evaluated can help you and your physician decide whether it has a place alongside that plan.

You can contact OxyRenew to speak with one of our Certified Hyperbaric Technicians. We can explain the principles of HBOT and how our sessions work, and answer your specific questions.